fix(app): resolve NameError by correctly referencing demo_with_voice

app.py

@@ -207,7 +207,7 @@ with demo_with_voice:
         return logo_paths[next_index], next_index
     
     # Set up automatic rotation on load
-    demo.load(
+    demo_with_voice.load(
         fn=lambda: (logo_paths[0], 0),
         outputs=[rotating_logo, logo_index_state],
         every=None